[vim/vim] The command-completion-custiom shows nothing in some conditions (Issue #19303)

Mao-Yining

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Feb 1, 2026, 7:54:05 AM (yesterday) Feb 1

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mao-yining created an issue (vim/vim#19303)

Steps to reproduce

command -nargs=1 -complete=custom,TestComplete T echo "<args>"

function! TestComplete(A, C, P) abort
  return a:C.a:C->split('[ =]')->join()
endfunction

when typing ':T=n' will have T=nT n

command -nargs=1 -complete=custom,TestComplete T echo "<args>"

function! TestComplete(A, C, P) abort
  return a:C->split('[ =]')->join()
endfunction

won't have any completion message when typing ':T=abc'

Expected behaviour

Output T=abc in the second case.

Version of Vim

9.1.2114

Environment

GVim
Windows 11

Logs and stack traces

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Christian Brabandt

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Feb 1, 2026, 10:52:42 AM (yesterday) Feb 1

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chrisbra left a comment (vim/vim#19303)

I am confused, shouldn't arguments be separated by spaces?

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Mao-Yining

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Feb 1, 2026, 10:54:09 AM (yesterday) Feb 1

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mao-yining left a comment (vim/vim#19303)

So do I am appalled when I found that the first demonstration can work.

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Christian Brabandt

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Feb 1, 2026, 10:57:26 AM (yesterday) Feb 1

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chrisbra left a comment (vim/vim#19303)

Well, for me it doesn't do anything, unless I type a space, so this: :T=n<tab> does not return anything, but this does: :T=n <tab>. Also for your second example.

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Mao-Yining

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Feb 1, 2026, 11:03:50 AM (yesterday) Feb 1

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mao-yining left a comment (vim/vim#19303)

Sorry I forget to tell you these setting to see the triggered things in time:

set wildmode=noselect:lastused,full
set wildmenu wildoptions=pum,fuzzy wildcharm=<Tab> pumheight=12
augroup CmdComplete
	au!
autocmd CmdlineChanged : call wildtrigger()
augroup END

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Mao-Yining

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Feb 1, 2026, 9:11:04 PM (23 hours ago) Feb 1

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Closed #19303 as completed.

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Mao-Yining

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Feb 1, 2026, 9:11:04 PM (23 hours ago) Feb 1

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mao-yining left a comment (vim/vim#19303)